PCI: add struct pci_host_bridge_window with CPU/bus address offset
Some PCI host bridges apply an address offset, so bus addresses on PCI are
different from CPU addresses. This patch adds a way for architectures to
tell the PCI core about this offset. For example:
LIST_HEAD(resources);
pci_add_resource_offset(&resources, host->io_space, host->io_offset);
pci_add_resource_offset(&resources, host->mem_space, host->mem_offset);
pci_scan_root_bus(parent, bus, ops, sysdata, &resources);
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 3a30023..3f07cb6 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1562,12 +1562,15 @@
struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
struct pci_ops *ops, void *sysdata, struct list_head *resources)
{
- int error, i;
+ int error;
struct pci_host_bridge *bridge;
struct pci_bus *b, *b2;
struct device *dev;
- struct pci_bus_resource *bus_res, *n;
+ struct pci_host_bridge_window *window, *n;
struct resource *res;
+ resource_size_t offset;
+ char bus_addr[64];
+ char *fmt;
bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
if (!bridge)
@@ -1617,19 +1620,30 @@
b->number = b->secondary = bus;
bridge->bus = b;
-
- /* Add initial resources to the bus */
- list_for_each_entry_safe(bus_res, n, resources, list)
- list_move_tail(&bus_res->list, &b->resources);
+ INIT_LIST_HEAD(&bridge->windows);
if (parent)
dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev));
else
printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev));
- pci_bus_for_each_resource(b, res, i) {
- if (res)
- dev_info(&b->dev, "root bus resource %pR\n", res);
+ /* Add initial resources to the bus */
+ list_for_each_entry_safe(window, n, resources, list) {
+ list_move_tail(&window->list, &bridge->windows);
+ res = window->res;
+ offset = window->offset;
+ pci_bus_add_resource(b, res, 0);
+ if (offset) {
+ if (resource_type(res) == IORESOURCE_IO)
+ fmt = " (bus address [%#06llx-%#06llx])";
+ else
+ fmt = " (bus address [%#010llx-%#010llx])";
+ snprintf(bus_addr, sizeof(bus_addr), fmt,
+ (unsigned long long) (res->start - offset),
+ (unsigned long long) (res->end - offset));
+ } else
+ bus_addr[0] = '\0';
+ dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr);
}
down_write(&pci_bus_sem);